SIMBAD references

Spectroscopic observations of metal-poor stars have indicated possible ⁶Li abundances that are much larger than the primordial abundance predicted in the standard big bang nucleosynthesis model. Possible mechanisms of ⁶Li production in metal-poor stars include pregalactic and cosmological cosmic-ray (CR) nucleosynthesis and nucleosynthesis by flare-accelerated nuclides. We study ⁹Be production via two-step α-fusion reactions of CR or flare-accelerated ^3, 4^He through ⁶He and ^6, 7^Li, in pregalactic structure, intergalactic medium, and stellar surfaces. We solve transfer equations of CR or flare particles and calculate nuclear yields of ⁶He, ^6, 7^Li, and ⁹Be taking account of probabilities of processing ⁶He and ^6, 7^Li into ⁹Be via fusions with α particles. Yield ratios, i.e., ⁹Be/⁶Li, are then calculated for the CR and flare nucleosynthesis models. We suggest that the future observations of ⁹Be in metal-poor stars may find enhanced abundances originating from metal-poor CR or flare activities.